/**
 *  Copyright 2007-2008 University Of Southern California
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package edu.isi.pegasus.planner.namespace.aggregator;


/**
 * An implementation of the Aggregator interface that takes the maximum of the
 * profile values. In the case of either of the profile values not valid
 * integers, the default value is picked up.
 *
 * @author Karan Vahi
 * @version $Revision$
 */
public class MAX extends Abstract{

    /**
     * Returns the maximum of two values.
     *
     * @param oldValue   the existing value for the profile.
     * @param newValue   the new value being added to the profile.
     * @param dflt       the default value to be used in case the values
     *                   are not of the correct type.
     *
     * @return the computed value as a String.
     */
    public String compute( String oldValue, String newValue, String dflt ){
        int val1 = parseInt( oldValue, dflt );
        int val2 = parseInt( newValue, dflt );

        return ( val2 > val1 )? Integer.toString( val2 ) : Integer.toString( val1 );
    }
}
